Refinement of Dendritic Structures by Induced Interdendritic Fluid Flow

通过诱导枝晶间流体流动细化枝晶结构

• 批准号: 9113679
• 负责人: Merton Flemings
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9113679&HistoricalAwards=false
• 关键词: Refinement; Dendritic; Structures; Induced; Interdendritic

This research examines the fragmentation of dendrites during solidification and their subsequent effects on refining the cast microstructure. Possible mechanisms of dendrite fracture in the semi-liquid/semi-solid state are examined to determine effects of electromagnetic-induced fluid flow and/or mechanical-driven flow on the process. Modeling of the flow behavior for simple and more complex geometries is planned. Cast geometries are employed that permit calculation of the interdendritic flow imposed by the force field. Optimum methods for dendrite breakup are expected to result from the research. %%% This research has potential future application in the casting of metal alloys with refined microstructures. Fine grained castings are expected to have improved mechanical properties over conventional castings.

本研究考察了凝固过程中枝晶的断裂及其对细化铸件组织的后续影响。研究了半液体/半固体状态下枝晶断裂的可能机制，以确定电磁感应流体流动和/或机械驱动流动对这一过程的影响。计划对简单和更复杂几何形状的流动行为进行建模。铸件几何形状被用来计算由力场施加的枝晶间流动。期望通过研究得出最佳的枝晶破碎方法。本研究在铸造具有精细组织的金属合金方面具有潜在的应用前景。细晶铸件有望比常规铸件具有更好的机械性能。